perldoc > ExtUtils::MY(3perl)

NAME
    ExtUtils::MY - ExtUtils::MakeMaker subclass for customization

SYNOPSIS
      # in your Makefile.PL
      sub MY::whatever {
          ...
      }

DESCRIPTION
    FOR INTERNAL USE ONLY

    ExtUtils::MY is a subclass of ExtUtils::MM. It is provided in your Makefile.PL for you to add
    and override MakeMaker functionality.

    It also provides a convenient alias via the MY class.

    ExtUtils::MY might turn out to be a temporary solution, but MY won't go away.